Table 2. Results of statistical analysis for suspected dishes of the breakfast and lunch on May 20.
| Meals | Dishes | Case | Control | OR (95% CI) | |||
| Yes | No | Yes | No | ||||
| Note: Dishes with statistical significance are highlighted in bold. Abbreviation: OR=odds ratio; CI=confidence interval. | |||||||
| Breakfast | Milk | 16 | 8 | 55 | 15 | 0.546 (0.196, 1.517) | |
| Boiled egg | 17 | 7 | 59 | 11 | 0.453 (0.152, 1.347) | ||
| Pickled mustard strips | 13 | 11 | 48 | 22 | 0.542 (0.210, 1.398) | ||
| Stir-fried zucchini | 21 | 3 | 53 | 17 | 2.245 (0.595, 8.467) | ||
| Stir-fried potato shreds | 22 | 2 | 57 | 13 | 2.509 (0.523, 12.034) | ||
| Lunch | Chinese hamburger (Roujiamo) | 21 | 3 | 36 | 34 | 6.611 (1.709, 37.058) | |
| Steamed Flatfish | 20 | 4 | 47 | 23 | 2.447 (0.697, 10.894) | ||
| Stir-fried Pork and Mushrooms | 19 | 5 | 52 | 18 | 1.315 (0.393, 5.157) | ||
| Stir-fried Pork Liver | 18 | 6 | 46 | 24 | 1.565 (0.505, 5.444) | ||
| Beef Stewed with Pumpkin | 15 | 9 | 51 | 19 | 0.692 (0.341, 1.406) | ||
| Stir-fried Cauliflower | 16 | 8 | 55 | 15 | 0.546 (0.178, 1.777) | ||